CN108462427B - Fan drive circuit - Google Patents
Fan drive circuit Download PDFInfo
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- CN108462427B CN108462427B CN201710137664.6A CN201710137664A CN108462427B CN 108462427 B CN108462427 B CN 108462427B CN 201710137664 A CN201710137664 A CN 201710137664A CN 108462427 B CN108462427 B CN 108462427B
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- fan
- electrically connected
- driving circuit
- switch element
- switching element
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- 230000005669 field effect Effects 0.000 claims description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- 239000004065 semiconductor Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/17—Circuit arrangements for detecting position and for generating speed information
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
- H03K17/08146—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in bipolar transistor switches
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Electronic Switches (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a fan driving circuit, which comprises a processing module and a rotating speed signal providing module. The rotation speed signal providing module comprises a first diode, a first impedance element, a first switch element, a second switch element and a third switch element. The second end of the first switch element receives a fan phase signal; the first end of the second switch element is electrically connected with the first end of the first impedance element, the second end of the second switch element is electrically connected with the second end of the first impedance element and the second end of the first diode, and the third end of the second switch element is electrically connected with the first end of the first switch element; the first end of the third switching element is electrically connected with a direct current voltage source, and the third end of the third switching element is electrically connected with the first end of the first diode. Under the reverse connection state, the first switch element of the rotation speed signal providing module cannot be burnt, the damage caused by mistaken wiring of a production line during the effective reduction of the production is avoided, and the use safety is improved more effectively.
Description
Technical Field
The present invention relates to a fan driving circuit, and more particularly, to a fan driving circuit which does not damage a circuit even when a voltage is applied to a reverse connection.
Background
The fan driving circuit is provided with a rotation speed providing pin (FG pin), and the main purpose of the setting is that after the fan is started, the control module at the system end can obtain the rotation speed of the fan motor through the rotation speed signal provided by the rotation speed signal providing pin. However, when the user carelessly connects the rotation speed signal providing pin to a ground potential, and the ground potential is electrically connected to a dc voltage, since the rotation speed providing pin (FG pin) is designed with a mosfet as a circuit, the dc voltage of the rotation speed providing pin is inversely connected, and a large value of dc current is generated through a Body Diode (Body Diode) of the mosfet inside the rotation speed providing pin, so that the mosfet of the rotation speed providing pin (FGpin) is burnt.
Therefore, how to provide a fan driving circuit that is not easily burned even when the reverse connection occurs has become an important issue in the industry.
Disclosure of Invention
The embodiment of the invention discloses a fan driving circuit, which is used for driving a fan, wherein the fan driving circuit is provided with a pulse width modulation signal pin, at least one driving pin and a third pin, and the fan driving circuit comprises: a processing module and a rotational speed signal providing module. The processing module is used for providing a fan phase signal. The rotating speed signal providing module is electrically connected with the processing module. The rotating speed providing module comprises a first diode and a second diode, wherein the first diode is provided with a first end and a second end; a first impedance element having a first end and a second end; a first switch element having a first end, a second end and a third end, wherein the third end of the first switch element is electrically connected to a ground potential, and the second end of the first switch element receives the fan phase signal; the second switch element is provided with a first end, a second end and a third end, wherein the first end of the second switch element is electrically connected with a third pin of the fan driving circuit and the first end of the first impedance element; and a third switching element having a first end, a second end and a third end, wherein the first end of the third switching element is electrically connected to a DC voltage source, the second end of the third switching element is electrically connected to a bias voltage, and the third end of the third switching element is electrically connected to the first end of the first diode.
Preferably, the fan driving circuit further comprises a control signal processing module electrically connected to the pwm signal pin of the fan driving circuit for receiving a pwm control signal.
Preferably, the fan driving circuit further comprises a driving module electrically connected to the processing module and the driving pin of the fan driving circuit, and the processing module controls the driving module to provide a fan driving signal to drive the fan according to the pwm control signal.
Preferably, the fan control device further comprises a hall detection module for detecting the phase change of the fan and providing a hall detection signal to the processing module.
Preferably, the first switching element and the third switching element are P-type metal oxide semiconductor field effect transistors, respectively.
Preferably, the second switching element is an N-type mosfet.
The embodiment of the invention discloses a fan driving circuit, which is used for driving a fan, wherein the fan driving circuit is provided with a pulse width modulation signal pin, at least one driving pin and a rotating speed signal providing pin, and comprises a processing module and a rotating speed signal providing module. The processing module is used for providing a fan phase signal. The rotating speed signal providing module is electrically connected with the processing module. The rotating speed providing module comprises a first diode and a second diode, wherein the first diode is provided with a first end and a second end; a first impedance element having a first end and a second end; a first switch element having a first end, a second end and a third end, wherein the third end of the first switch element is electrically connected to a ground potential, and the second end of the first switch element receives the fan phase signal; a second switch element having a first end, a second end and a third end, wherein the first end of the second switch element is electrically connected to the rotational speed signal providing pin of the fan driving circuit and the first end of the first impedance element, the second end of the second switch element is electrically connected to the second end of the first impedance element and the second end of the first diode, and the third end of the second switch element is electrically connected to the first end of the first switch element; and a current source electrically connected to the first end of the first diode. When a ground pin of the fan driving circuit is electrically connected to a high level voltage and a rotating speed signal providing pin of the fan driving circuit is electrically connected to a ground potential, the current source does not act.
Preferably, the current source includes a third switching element having a first end, a second end and a third end, wherein the first end of the third switching element is electrically connected to a dc voltage source, the second end of the third switching element is electrically connected to a bias voltage, and the third end of the third switching element is electrically connected to the first end of the first diode.
Preferably, the fan driving circuit further comprises a control signal processing module electrically connected to the pwm signal pin of the fan driving circuit for receiving a pwm control signal.
Preferably, the fan driving circuit further comprises a driving module electrically connected to the processing module and the driving pin of the fan driving circuit, and the processing module controls the driving module to provide a fan driving signal to drive the fan according to the pwm control signal.
Preferably, when a ground pin of the fan driving circuit is electrically connected to a high level voltage and the rotational speed signal providing pin of the fan driving circuit is electrically connected to a ground potential, the second switch element is not activated.
Preferably, the first switch element is a P-type metal oxide semiconductor field effect transistor.
Preferably, the second switching element is an N-type mosfet.
Preferably, the third switching element is a P-type metal oxide semiconductor field effect transistor.
In summary, in the fan driving circuit of the present invention, the rotation speed signal providing module is added with the second switch element, the third switch element (or a current source), the first impedance element and the first diode, so that the rotation speed signal can be normally output in the normal operation state, and the first switch element of the rotation speed signal providing module cannot be burnt in the reverse connection state, thereby effectively reducing the damage caused by the mis-wiring of the production line in mass production, more effectively reducing the cost and improving the safety in use.
Drawings
Fig. 1 is a schematic diagram of a fan driving circuit according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a fan driving circuit pin according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a rotational speed signal providing module according to an embodiment of the invention.
FIG. 4 is a schematic diagram of a rotational speed signal providing module in reverse connection according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. In the drawings, the size and relative sizes of display layers and regions may be exaggerated for clarity. Like numbers refer to like elements throughout.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The fan driving circuit will be described with reference to the drawings by way of at least one embodiment, which is not intended to limit the disclosure.
[ embodiment of Fan drive Circuit of the present invention ]
In this embodiment, for convenience of description, the electronic device having three or more pins has its ends described by end marks, if the electronic device having two pins is arranged in a horizontal direction, its right side is a first end, and its left side is a second end, if the electronic device having two pins is arranged in a vertical direction, its upper side is a first end, and its lower side is a second end.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a fan driving circuit according to a first embodiment of the invention. Fig. 2 is a schematic diagram of a fan driving circuit pin according to an embodiment of the invention.
The fan driving circuit 1 includes a processing module 10, a control signal processing module 11, a driving module 12 and a rotational speed signal providing module 14.
In this embodiment, the control signal processing module 11, the driving module 12 and the rotation speed signal providing module 14 are all electrically connected to the processing module 10.
In this embodiment, the control signal processing module 11 is electrically connected to a PWM signal pin PWM. The driving module 12 is electrically connected to at least one driving pin (not shown). The rotation speed signal providing module 14 is electrically connected to a rotation speed signal providing pin FG. In the present embodiment, the fan driving circuit 1 further includes an input voltage pin VIN and a ground pin GND, which are respectively connected to a dc voltage (not shown) and a ground potential (not shown) to enable the fan driving circuit 1 to operate normally.
The control signal processing module 11 receives a fan control signal transmitted by a control circuit (not shown) through the PWM signal pin PWM for analysis and processing, and converts the fan control signal into a processing signal. The control signal processing module 11 transmits the processing signal to the processing module 10. The processing module 10 provides a plurality of control signals to the driving module 12 according to the processing signals transmitted by the control signal processing module 11.
The driving module 12 provides a plurality of fan driving signals to the fan 2 to drive the fan 2 according to the plurality of control signals transmitted by the processing module 10. In this embodiment, the driving module 12 can be an H-Bridge driving circuit (H-Bridge) or a Bridge driving circuit or a three-phase Bridge driving circuit. The H-Bridge driving circuit comprises four Metal Oxide Semiconductor Field Effect Transistors (MOSFET) or Bipolar Junction Transistors (BJT). In this embodiment, the driving module 12 is a driving circuit of a single-phase motor, and in other embodiments, the driving module 12 may be a driving circuit of a two-phase motor or a three-phase motor, which is not limited in the present invention. In addition, in the embodiment, the driving module 12 is electrically connected to driving pins (not shown) of the fan driving circuit 1 to transmit the fan driving signal, and in other embodiments, the driving module 12 may be electrically connected to a plurality of pins to transmit a plurality of sets of driving signals to the fan 2, which is not limited in the present invention.
The rotation speed signal providing module 14 generates a rotation speed signal corresponding to the fan phase variation according to the fan phase variation detected by an external hall detection module (not shown). In the embodiment, the rotation speed signal providing module 14 is electrically connected to the rotation speed signal providing pin FG of the fan driving circuit 1, and transmits a rotation speed signal corresponding to the fan phase change to the control circuit (not shown) through the rotation speed signal providing pin FG of the fan driving circuit 1. In other embodiments, the hall detection module may also be built in the fan driving circuit 1, which is not limited in the present invention.
Referring to fig. 3, fig. 3 is a schematic diagram of a rotation speed signal providing module according to a first embodiment of the invention.
The tacho signal providing module 14 includes a first switch element M1, a second switch element M2, a third switch element M3, a first impedance element R1, and a first diode D1. The first switching element M1, the second switching element M2 and the third switching element M3 respectively have a first body diode BD1, a second body diode BD2 and a third body diode BD 3.
In the present embodiment, the first switch element M1, the second switch element M2 and the third switch element M3 respectively have a first terminal, a second terminal and a third terminal. The first end of the first switch element M1 is electrically connected to the third end of the second switch element M2, the second end of the first switch element M1 receives a fan phase signal transmitted by the processing module 10, and the first switch element M1 is turned on or off according to the fan phase signal to transmit a rotation speed signal from the first end of the first switch element M1.
A first end of the second switch element M2 is electrically connected to the rotation speed signal providing pin FG of the fan driving circuit 1 and a first end of the first impedance element R1. A second terminal of the second switch device M2 is electrically connected to the second terminal of the first impedance device R1 and the second terminal (cathode terminal) of the first diode D1. A first end of the third switching element M3 is electrically connected to a dc voltage source VDD. The second terminal of the third switching element M3 is electrically connected to a bias voltage VB. The third terminal of the third switching element M3 is electrically connected to the first terminal (anode terminal) of the first diode D1. In this embodiment, when the fan driving circuit 1 operates normally, the bias voltage VB continuously provides a stable voltage to the second terminal of the third switching element M3 to turn on the third switching element M3, so as to provide a voltage sufficient for turning on the second switching element M2 to the second terminal of the second switching element M2 to turn on the second switching element M2. At this time, the first switch element M1 is turned on or off according to the fan phase signal to generate a rotation speed signal, and the rotation speed signal can be transmitted via the first terminal of the second switch element M2 and the rotation speed signal providing pin FG of the fan circuit 1. In this embodiment, the first impedance element is a resistor. In other embodiments, the present invention can be modified according to other requirements, and is not limited in the present invention. In the present embodiment, the type of the first diode D1 is not limited in the present invention.
In some specific applications, the rotation speed signal providing pin FG is electrically connected to an external pull-up voltage (e.g., 12V dc voltage), so as to avoid that the fan driving circuit 1 and the external circuit are burnt out due to any current path inside the fan driving circuit 1 between the rotation speed signal providing pin FG and the dc voltage VDD under the condition that the external voltage of the rotation speed signal providing pin FG of the fan driving circuit 1 is higher than the dc voltage source VDD. Therefore, the first diode D1 is disposed between the third terminal of the third switching element M3 and the second terminal of the second switching element M2 to block any possible current path from the rotation speed signal providing pin FG to the dc voltage VDD. In addition, the voltage drop of the external pull-up voltage of the pin FG provided by the rotation speed signal due to the internal current path of the fan driving circuit 1 can be avoided.
In the present embodiment, the first switch device M1 and the third switch device M3 are a P-type metal oxide semiconductor field effect transistor (P-MOSFET), and the second switch device M2 is an N-type metal oxide semiconductor field effect transistor (N-MOSFET).
In this embodiment, an electrostatic discharge protection device (ESD component) may be disposed between the third terminal of the third switching element M3 and the ground potential. That is, between the third terminal of the third switching element M3 and the first diode D1, and the ground potential. In addition, an electrostatic discharge protection device (ESD component) may be disposed between the dc voltage source VDD and the ground potential. In addition, an electrostatic discharge protection device (ESD component) can be disposed between the FG pin and the ground potential. Further, an electrostatic discharge protection device (ESD component) may be disposed between the third terminal of the second switching element M2 and the ground potential, that is, an electrostatic discharge protection device (ESDcomponent) may be disposed between the third terminal of the second switching element M2 and the connection point of the first switching element M1 and the ground potential. The configuration of the esd protection device can be adjusted according to actual requirements, and is not limited in the present invention.
Referring to fig. 4, fig. 4 is a schematic diagram of a rotation speed signal providing module in reverse connection according to an embodiment of the present invention.
In the present embodiment, the fan driving circuit 1 is in the reverse connection state, in which the rotation speed signal providing pin FG is connected to a ground potential (0V), and a ground pin (not shown) of the fan driving circuit 1 is connected to a dc voltage source VDD, in the present embodiment, the voltage value of the dc voltage source VDD is 5V. The voltage values shown in fig. 4 are the voltage values at the respective points in the reverse connection state.
In this embodiment, the second terminal of the third switching element M3 is 4.7V, the third terminal of the third switching element M3 is 0-0.7V, and the difference is 4.7V-4V, and the third switching element M3 is a P-type metal oxide semiconductor field effect transistor (P-MOSFET). The difference between the first terminal and the second terminal of the third switching element M3 is smaller than a threshold voltage, which is generally 0.5V-1V, and the third switching element M3 is turned on, so that the difference between the first terminal and the second terminal of the third switching element M3 is much larger than the threshold voltage under the reverse connection condition, and therefore, the third switching element M3 is inactive under the reverse connection condition, that is, the third switching element M3 is in the off state. The first end of the second switch element M2 is electrically connected to the rotation speed signal providing pin FG of the fan driving circuit 1, and is connected to 0V in the reverse connection state. The second terminal of the second switch element M2 is connected in series to the first terminal of the second switch element M2 through the first impedance element R1, and therefore the voltage thereof is also 0V. In this case, the second switching element M2 is also inactive, i.e., the second switching element M2 is closed. That is, when the fan driving circuit 1 is reversely connected, the first diode D1 can isolate the dc voltage VDD from the driving signal of the second switch element M2 to prevent the second switch element M2 from operating.
At this time, no matter the first switch element M1 is in an active or inactive state, since the second switch element M2 electrically connected to the first end of the first switch element M1 is in an off state (i.e., the impedance is very large), and the second body diode BD2 of the second switch element M2 does not allow the dc voltage VDD to pass therethrough, the dc voltage VDD does not pass through the first body diode BD1 of the first switch element M1 and the second body diode BD2 of the second switch element M2, and a path is generated with the ground potential of the speed signal providing pin FG in the reverse connection state, so that a large current is generated, and the first switch element M1 is not burned out.
In summary, in the fan driving circuit of the present invention, the rotation speed signal providing module is added with the second switch element, the third switch element (or a current source), the first impedance element and the first diode, so that the rotation speed signal can be normally output in the normal operation state, and the first switch element of the rotation speed signal providing module cannot be burnt in the reverse connection state, thereby effectively reducing the damage caused by the mis-wiring of the production line in mass production, more effectively reducing the cost and improving the safety in use.
The above description is only an example of the present invention, and is not intended to limit the scope of the present invention.
Claims (16)
1. A fan driving circuit for driving a fan, the fan driving circuit having at least one driving pin and a rotational speed signal providing pin, the fan driving circuit comprising:
a processing module for providing a fan phase signal;
a rotational speed signal provides the module, electric connection the processing module, the rotational speed signal provides the module and includes:
a first diode having a first end and a second end;
a first impedance element having a first end and a second end;
a first switch element having a first end, a second end and a third end, wherein the third end of the first switch element is electrically connected to a ground potential, and the second end of the first switch element receives the fan phase signal;
a second switch element having a first end, a second end and a third end, wherein the first end of the second switch element is electrically connected to a rotational speed signal providing pin of the fan driving circuit and the first end of the first impedance element, the second end of the second switch element is electrically connected to the second end of the first impedance element and the second end of the first diode, and the third end of the second switch element is electrically connected to the first end of the first switch element; and
a third switching element having a first end, a second end and a third end, wherein the first end of the third switching element is electrically connected to a dc voltage source, the second end of the third switching element is electrically connected to a bias voltage, and the third end of the third switching element is electrically connected to the first end of the first diode.
2. The fan drive circuit as claimed in claim 1, further comprising:
and the control signal processing module is electrically connected with a pulse width modulation signal pin of the fan driving circuit to receive a pulse width modulation control signal.
3. The fan drive circuit as claimed in claim 2, further comprising:
and the processing module controls the driving module to provide a fan driving signal to drive the fan according to the pulse width modulation control signal.
4. The fan drive circuit as claimed in claim 1, further comprising:
and the Hall detection module is used for detecting the phase change of the fan and providing a Hall detection signal for the processing module.
5. The fan driving circuit as claimed in claim 1, wherein the first switching element and the third switching element are a P-type metal oxide semiconductor field effect transistor, respectively.
6. The fan driving circuit as claimed in claim 1, wherein the second switching element is an N-type metal oxide semiconductor field effect transistor.
7. The fan-driving circuit as claimed in claim 1, wherein when a ground pin of the fan-driving circuit is electrically connected to a high level voltage and the rotation speed signal providing pin of the fan-driving circuit is electrically connected to a ground potential, a voltage difference between the first end of the third switching element and the second end of the third switching element is greater than a threshold voltage, and the third switching element is not activated.
8. A fan driving circuit for driving a fan, wherein the fan driving circuit has at least one driving pin and a rotational speed signal providing pin, the fan driving circuit comprising:
a processing module for providing a fan phase signal;
a rotational speed signal provides the module, electric connection the processing module, the rotational speed signal provides the module and includes:
a first diode having a first end and a second end;
a first impedance element having a first end and a second end;
a first switch element having a first end, a second end and a third end, wherein the third end of the first switch element is electrically connected to a ground potential, and the second end of the first switch element receives the fan phase signal;
a second switch element having a first end, a second end and a third end, wherein the first end of the second switch element is electrically connected to the rpm signal providing pin of the fan driving circuit and the first end of the first impedance element, the second end of the second switch element is electrically connected to the second end of the first impedance element and the second end of the first diode, and the third end of the second switch element is electrically connected to the first end of the first switch element; and
a current source electrically connected to the first end of the first diode;
when a ground pin of the fan driving circuit is electrically connected to a high level voltage and the rotational speed signal providing pin of the fan driving circuit is electrically connected to a ground potential, the current source does not operate.
9. The fan drive circuit as claimed in claim 8, wherein the current source comprises:
a third switching element having a first end, a second end and a third end, wherein the first end of the third switching element is electrically connected to a dc voltage source, the second end of the third switching element is electrically connected to a bias voltage, and the third end of the third switching element is electrically connected to the first end of the first diode.
10. The fan drive circuit as claimed in claim 8, further comprising:
and the control signal processing module is electrically connected with a pulse width modulation signal pin of the fan driving circuit to receive a pulse width modulation control signal.
11. The fan drive circuit as claimed in claim 10, further comprising:
and the processing module controls the driving module to provide a fan driving signal to drive the fan according to the pulse width modulation control signal.
12. The fan drive circuit as claimed in claim 8, wherein the second switch element is disabled when a ground pin of the fan drive circuit is electrically connected to a high level voltage and the tacho signal providing pin of the fan drive circuit is electrically connected to a ground potential.
13. The fan driving circuit according to claim 8, wherein the first switching element is a P-type metal oxide semiconductor field effect transistor.
14. The fan driving circuit as claimed in claim 8, wherein the second switching element is an N-type metal oxide semiconductor field effect transistor.
15. The fan driving circuit as claimed in claim 9, wherein the third switching element is a P-type metal oxide semiconductor field effect transistor.
16. The fan-driving circuit as claimed in claim 9, wherein when a ground pin of the fan-driving circuit is electrically connected to a high level voltage and the rotation speed signal providing pin of the fan-driving circuit is electrically connected to a ground potential, a voltage difference between the first end of the third switching element and the second end of the third switching element is greater than a threshold voltage, and the third switching element is not activated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW106105587 | 2017-02-20 | ||
| TW106105587A TWI623167B (en) | 2017-02-20 | 2017-02-20 | Fan driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108462427A CN108462427A (en) | 2018-08-28 |
| CN108462427B true CN108462427B (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710137664.6A Active CN108462427B (en) | 2017-02-20 | 2017-03-09 | Fan drive circuit |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US10270376B2 (en) |
| CN (1) | CN108462427B (en) |
| TW (1) | TWI623167B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI674744B (en) * | 2018-05-18 | 2019-10-11 | 應廣科技股份有限公司 | Four-External-Wire Motor Control System and Data Setting Method and Wirings Therefor |
| TWI818822B (en) * | 2022-12-06 | 2023-10-11 | 應廣科技股份有限公司 | Data setting method of four-external-wire motor control system |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW417916U (en) * | 1999-02-25 | 2001-01-01 | Silicon Touch Tech Inc | Brushless fan control circuit with an overall protection function |
| ATE461551T1 (en) * | 2001-10-10 | 2010-04-15 | Ebm Papst St Georgen Gmbh & Co | METHOD FOR OPERATING AN ELECTRONICALLY COMMUTATED MOTOR, AND MOTOR FOR PERFORMING SUCH A METHOD |
| WO2003085808A1 (en) * | 2002-04-11 | 2003-10-16 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Electronically commutated dc motor comprising a bridge circuit |
| CN100455958C (en) * | 2003-01-28 | 2009-01-28 | 广东科龙电器股份有限公司 | Control method and device for straight-flow fan of air-cooled refrigerator |
| JP4746942B2 (en) * | 2005-08-31 | 2011-08-10 | 三洋電機株式会社 | Motor speed control integrated circuit |
| JP4680013B2 (en) * | 2005-09-06 | 2011-05-11 | 三洋電機株式会社 | Motor drive circuit |
| JP4779944B2 (en) * | 2006-11-20 | 2011-09-28 | 株式会社デンソー | Disconnection detection circuit |
| TWI394362B (en) * | 2009-09-11 | 2013-04-21 | Anpec Electronics Corp | Method of driving dc motor and related circuit for avoiding reverse current |
| US8299735B2 (en) * | 2010-01-27 | 2012-10-30 | Sunonwealth Electric Machine Industry Co., Ltd. | Fan system and brake control circuit thereof |
| TWI398092B (en) * | 2010-07-07 | 2013-06-01 | Anpec Electronics Corp | Rotation speed control circuit, rotation speed control method and fan system |
| TWI441448B (en) * | 2011-01-06 | 2014-06-11 | Anpec Electronics Corp | Power control circuit, switching power converter, and method for reducing noise and switching loss |
| DE102012014559A1 (en) * | 2011-08-06 | 2013-02-07 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Fan |
| TWI436582B (en) * | 2012-05-15 | 2014-05-01 | Anpec Electronics Corp | Motor driving circuit and method thereof |
| CN202833239U (en) * | 2012-07-31 | 2013-03-27 | 江苏浩峰汽车附件有限公司 | PWM controller of two-blower cooling fan for automobile engine |
| CN103973201B (en) * | 2013-01-25 | 2016-05-25 | 立锜科技股份有限公司 | Tool is shared motor controller and the corresponding control methods of pin position |
| CN103475285B (en) * | 2013-09-12 | 2016-04-20 | 北京航空航天大学 | A kind of magnetically levitated flywheel brushless DC motor control system |
| CN204179972U (en) * | 2014-09-01 | 2015-02-25 | 常州乐士雷利电机有限公司 | There is the three-phase full-wave brushless DC motor control system of reversal connection protection function |
| KR101601223B1 (en) * | 2014-10-24 | 2016-03-08 | 현대자동차주식회사 | Wiper control apparatus of vemhicle |
-
2017
- 2017-02-20 TW TW106105587A patent/TWI623167B/en active
- 2017-03-09 CN CN201710137664.6A patent/CN108462427B/en active Active
- 2017-07-28 US US15/663,665 patent/US10270376B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| TW201832437A (en) | 2018-09-01 |
| CN108462427A (en) | 2018-08-28 |
| US20180241329A1 (en) | 2018-08-23 |
| US10270376B2 (en) | 2019-04-23 |
| TWI623167B (en) | 2018-05-01 |
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